GABRB2 and neoplasm: Moreover, the univariate and multivariate cox-regressions, using these genes, HPV infection, and tumor histology as covariates, showed that only TMEM40 and GABRB2 were able to independently differentiate the OS of the patients, whereas HPV infection or tumor histology were not significant factors for the OS (Likelihood ratio test p = 0.05, Wald test p = 0.09, Logrank test p = 0.06) (Table 4).